Harris, December 2009's Playmate of the Month, has not been added to the editor's pre-existing will. Hefner's estimated $43 million fortune is promised to "his children, the University of Southern California film school and a variety of charities," the source says.

Before their big day, Harris explained why she got cold feet in 2011. "Last time it turned into a big ordeal and then it all fell apart," she told Us. "This time around is amazing. ... I'm very happy and Hef's very happy and we're excited."